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Meeting Minutes 3130100 <br /> Page 4 of 7 <br /> . 2K1111104+ C2HCL3 --� 2CO2 + 2Mn02 + 2K+ + 3CL-+ H- <br /> Potassium permanganate has lowered TCE concentrations belo'A reporting <br /> limits in areas of the A-aquifer that it has reached during the pilot test <br /> Although thele is sonic evidence that TCE concentrations may rebound once the <br /> potassium permanganate is removed, this remedial alternative shows a lot of <br /> promise for remediating TCE in the source area The results of the pilot test are <br /> scheduled to be reported in mid-April 2000 per the Waste Discharge <br /> Requirements <br /> 4 Nestle Groundwater Model <br /> George Losonsky (IT Group) presented an overview of Nestle ground%ater modeling <br /> efforts This presentation facilitated general discussion of modeling assumptions and <br /> potential data gaps were identified This item is summarized below and in the attached <br /> slides <br /> a Visual Modflow was used to model the local ground water flo« system and the <br /> model boundaries were placed several miles outside the area of concern The <br /> model includes 9 layers with varying hydraulic conductivities <br /> Hydraulic conductivities were determined from pump tests north of the <br /> Stanislaus River Hydraulic conductivities in other areas were denved <br /> empirically and based on regional hydrogeological research. <br /> • Future groundwater consumption by the City of Ripon was extrapolated from <br /> 1994 to 1998 monthly production data to the Year 2025 The growth rate for <br /> the City of Ripon was based on regional data(growth rate for the city of <br /> Sacramento) instead of the Ripon General Plan However, Dale Ramey <br /> concurred with the projected population growth presented by George Losonsky <br /> Potential groundwater withdrawals that are not included or may not be correctly <br /> accourited for in the model include the Fox River Paper wells, Caltrans well <br /> (Parallel Avenue/East Main Street), agricultural wells, Jack Tone Golf Course, <br /> and Spring Creek Golf and Country Club A 500 gpm extraction rate was <br /> assumed for the Fox River Paper wells However, Dale Ramz-y stated that he is <br /> unsure whether these wells are still being used because Fox River Paper is using <br /> approximately 500 gpm of City water <br /> d The report detailing modeling efforts will be issued upon completion <br /> .4..�_.._. ra _. !-',..-...-../T.,.-.», , Il -LO-11 )7-- Aivnr Pn"ZiV ion Adrn1df/7IC (rPIIrRP/TPnP1 <br /> lictio;L 14GN1�1 VGW Scr,i c-urr 'r .r�••--�.• + v.., — �- - �+� . - -- _.__ Q_ _ <br /> will check into the potentially significant withdrawals that were not modeled, and revise <br /> •� the model accordingly George/Jean will obtain a copy of the Ripon General Plan and <br /> revise assumptions on future withdrawals by the City of Ripon <br />